//入口文件

var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan'); //日志操作
var session = require('express-session');
var bodyParser = require('body-parser');

var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');
var commentRouter = require('./routes/comment')

var app = express(); //实例化一个对象                               

// view engine setup
app.set('views', path.join(__dirname, 'views')); //模板引擎，设置了视图的引擎
app.set('view engine', 'ejs');

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public'))); //设置了静态资源的文件目录

app.use(session({
    secret: 'recommand 128 bytes random string',
    cookie: { maxAge: 20 * 60 * 1000 },
    resave: true,
    saveUninitialized: true
}))


//静态路由表
app.use('/', indexRouter);
app.use('/users', usersRouter);
app.use('/comment', commentRouter);


// catch 404 and forward to error handler
app.use(function(req, res, next) {
    next(createError(404));
});

// error handler
app.use(function(err, req, res, next) {
    // set locals, only providing error in development
    res.locals.message = err.message;
    res.locals.error = req.app.get('env') === 'development' ? err : {};

    // render the error page
    res.status(err.status || 500);
    res.render('error');
});

module.exports = app;